linux-kernel - Re: [RFC PATCH] fs: introduce ST_HUGE flag and set it to tmpfs and hugetlbfs

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Message-ID: <20180417232248.GA27631@bombadil.infradead.org>
Date:   Tue, 17 Apr 2018 16:22:48 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     viro@...iv.linux.org.uk, nyc@...omorphy.com,
        mike.kravetz@...cle.com, kirill.shutemov@...ux.intel.com,
        hughd@...gle.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] fs: introduce ST_HUGE flag and set it to tmpfs and
 hugetlbfs

On Wed, Apr 18, 2018 at 05:08:13AM +0800, Yang Shi wrote:
> When applications use huge page on hugetlbfs, it just need check the
> filesystem magic number, but it is not enough for tmpfs. So, introduce
> ST_HUGE flag to statfs if super block has SB_HUGE set which indicates
> huge page is supported on the specific filesystem.

Hm.  What's the plan for communicating support for page sizes other
than PMD page sizes?  I know ARM has several different page sizes,
as do PA-RISC and ia64.  Even x86 might support 1G page sizes through
tmpfs one day.